dnl Process this file with autoconf to produce a configure script.

AC_COPYRIGHT([
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software
Foundation, Inc.

This file is part of the MPFR Library.

The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License, or (at
your option) any later version.

The MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
])

dnl If MPFR becomes GNU MPFR, change the MPFR below to GNU MPFR
dnl Add check-news when it checks for more than 15 lines
AC_INIT(MPFR, 2.2.0)
AM_INIT_AUTOMAKE([no-define dist-zip dist-bzip2])
dnl AM_MAINTAINER_MODE

dnl AC_CONFIG_HEADERS([mpfrconf.h:mpfrconf.in])

dnl Extra arguments to configure
AC_ARG_WITH(gmp_include, 
   [  --with-gmp-include=DIR  GMP include directory ], 
   CPPFLAGS="$CPPFLAGS -I$withval")
AC_ARG_WITH(gmp_lib, 
   [  --with-gmp-lib=DIR      GMP lib directory ], 
   LDFLAGS="-L$withval $LDFLAGS")
AC_ARG_WITH(gmp_build, 
   [  --with-gmp-build=DIR    GMP build directory], [
    CPPFLAGS="$CPPFLAGS -I$withval -I$withval/tune"
    LDFLAGS="-L$withval -L$withval/.libs -L$withval/tune/ $LDFLAGS"
    if test -r $withval/Makefile ; then
     GMP_CFLAGS=`grep -w "CFLAGS =" $withval/Makefile | sed 's/CFLAGS = //'`
     GMP_CC=`grep -w "CC =" $withval/Makefile | sed 's/CC = //'`
    fi
   ])
AC_ARG_WITH(gmp, 
   [  --with-gmp=DIR          GMP install directory ], [
   CPPFLAGS="$CPPFLAGS -I$withval/include"
   LDFLAGS="-L$withval/lib $LDFLAGS" ])

AC_ARG_WITH(irix64, 
   [  --with-irix64=on/off    Irix 32/64 bits support ], 
   with_irix64=$withval, with_irix64=off)

AC_ARG_WITH(mulhigh_size,
   [  --with-mulhigh-size=NUM Internal threshold table for mulhigh],
   AC_DEFINE_UNQUOTED([MPFR_MULHIGH_SIZE],$withval, [Mulhigh size])) 

AC_ARG_ENABLE(assert,
   [  --enable-assert         enable ASSERT checking [[default=no]]],
   [ case $enableval in
      yes) AC_DEFINE([WANT_ASSERT],1,[Want assertion]) ;;
      no)  ;;
      full) AC_DEFINE([WANT_ASSERT],2,[Want assertion]) ;;
      *) AC_MSG_ERROR([bad value for --enable-assert: yes, no or full]) ;;
     esac])
AC_ARG_ENABLE(logging,
   [  --enable-logging        enable MPFR Logging [[default=no]]],
   [ disable_gcc_format_warning=yes
     case $enableval in
      yes) AC_DEFINE([MPFR_USE_LOGGING],1,[Log what MPFR does]) ;;
      no)  ;;
      *)   AC_MSG_ERROR([bad value for --enable-logging: yes or no]) ;;
     esac])
AC_ARG_ENABLE(thread-safe,
   [  --enable-thread-safe    Build MPFR as thread safe [[default=no]]],
   [ case $enableval in
      yes) AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe]) ;;
      no)  ;;
      *)   AC_MSG_ERROR([bad value for --enable-thread-safe: yes or no]) ;;
     esac])

test_CFLAGS=${CFLAGS+set}


dnl
dnl Setup CC and CFLAGS 
dnl

dnl Check if user request its CC and CFLAGS
if test -n "$CFLAGS" || test -n "$CC" ; then
 user_redefine_cc=yes
fi
dnl Autoconf detection
AC_PROG_CC
AC_LANG(C)

dnl Check for GMP CFLAGS and CC (More optimized for the target)
dnl But they may be invalid, so we must check them first
dnl Don't redefine it if the user force them!
if test -n "$GMP_CFLAGS" && test -z "$user_redefine_cc" ; then
 old_cflags=$CFLAGS
 old_cc=$CC
 CFLAGS=$GMP_CFLAGS
 CC=$GMP_CC
 AC_MSG_CHECKING(for CC=$GMP_CC and CFLAGS=$GMP_CFLAGS)
 AC_RUN_IFELSE([AC_LANG_PROGRAM([[]],[[]])], [AC_MSG_RESULT(yes)], [
    AC_MSG_RESULT(no)
    CFLAGS=$old_cflags
    CC=$old_cc
  ], [
    AC_MSG_RESULT([can't test])
    CFLAGS=$old_cflags
    CC=$old_cc
  ])
  dnl CC may have change. Recheck for GCC.
  GCC=
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifndef __GNUC__
# error "GCC Not Found"
#endif
  ]])], [
  GCC=yes
  ])
fi

dnl Check if compiler is ICC, and if such a case, disable GCC
dnl And add some specific flags.
dnl Don't add Warnings Flags (Otherwise you'll get more than 20000 warnings).
dnl Add -long_double flags? Don't use -pc64 !
AC_MSG_CHECKING(for ICC)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if !defined(__ICC)
# error "ICC Not Found"
#endif
]], [[]])],[AC_MSG_RESULT(yes)
 GCC=
 CFLAGS="-fp_port -mp -wd1572 -wd265 -wd186 -wd239 $CFLAGS"
],[AC_MSG_RESULT(no)])

dnl If compiler is gcc, then use some specific flags.
dnl But don't touch user other flags.
if test "$test_CFLAGS" != set && test -n "$GCC"; then
  CFLAGS="-Wall -Wmissing-prototypes $CFLAGS"
  if test -n "$disable_gcc_format_warning" ; then
   CFLAGS="$CFLAGS -Wno-format"
  fi
fi

AM_C_PROTOTYPES
AC_CANONICAL_HOST
AC_CHECK_OS
AC_CHECK_MACHTYPE

dnl Set the OS-dependent flags.
case $OS_TYPE in
  HP-UX*)
	if test -n "$GCC"; then
	  LDFLAGS="-Xlinker +allowunsats $LDFLAGS"
	fi
	;;
  IRIX64)
	if [[ "$irix64" = "on" ]]; then
	  CFLAGS ="-mabi=64 $CFLAGS"
	else
	  CFLAGS ="-mabi=n32 $CFLAGS"
	fi
	;;
esac

AC_C_CONST
AC_C_VOLATILE
MPFR_CONFIGS

dnl Must be checked with the LIBM
dnl but we don't want to add the LIBM to MPFR dependency.
dnl Can't use AC_CHECK_FUNCS since the function may be in LIBM but
dnl not exported in math.h
saved_LIBS="$LIBS"
LIBS="$LIBS $MPFR_LIBM"
dnl AC_CHECK_FUNCS([round trunc floor ceil nearbyint])
AC_MSG_CHECKING(for math/round)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
int f (double (*func)(double)) { return 0;}
]], [[
 double a = 17.42;
 a = f (round);
 return 0;
]])], [
   AC_MSG_RESULT(yes) 
   AC_DEFINE(HAVE_ROUND, 1,[Have ISO-C99 round function])
],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/trunc)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
int f (double (*func)(double)) { return 0;}
]], [[
 double a = 17.42;
 a = f(trunc);
 return 0;
]])], [
   AC_MSG_RESULT(yes) 
   AC_DEFINE(HAVE_TRUNC, 1,[Have ISO-C99 trunc function])
],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/floor)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
int f (double (*func)(double)) { return 0;}
]], [[
 double a = 17.42;
 a = f(floor);
 return 0;
]])], [
   AC_MSG_RESULT(yes) 
   AC_DEFINE(HAVE_FLOOR, 1,[Have ISO-C99 floor function])
],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/ceil)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
int f (double (*func)(double)) { return 0;}
]], [[
 double a = 17.42;
 a = f(ceil);
 return 0;
]])], [
   AC_MSG_RESULT(yes) 
   AC_DEFINE(HAVE_CEIL, 1,[Have ISO-C99 ceil function])
],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/rint)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
int f (double (*func)(double)) { return 0;}
]], [[
 double a = 17.42;
 a = f(nearbyint);
 return 0;
]])], [
   AC_MSG_RESULT(yes) 
   AC_DEFINE(HAVE_NEARBYINT, 1,[Have ISO-C99 rint function])
],[AC_MSG_RESULT(no)])

LIBS="$saved_LIBS"

dnl
dnl Setup LIBTOOL
dnl
dnl Currently libtool always want to detect a C++ and fortran compiler
dnl Remove this by hacking a few: AC_PROG_CXX, AC_PROG_F77 are defined
dnl but they are never called. Set with_tag to ''
dnl Set am__fastdepCXX to something
dnl Remove this when Libtool >= 2.0 is used
if test -n "$variable_indefinie" ; then
 AC_PROG_CXX([g++])
 AC_PROG_F77([g77])
 AC_PROG_CXXCPP
fi
am__fastdepCXX_FALSE='#'
if test "${with_tags+set}" != set; then
  with_tags=
fi

dnl Configs for Windows DLLs.
dnl libtool requires "-no-undefined" for win32 dll
AC_DISABLE_SHARED
AC_LIBTOOL_WIN32_DLL
case $host in
  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2*)
   AC_MSG_CHECKING(for DLL/static GMP)
   if test "$enable_shared" = yes; then
     LDFLAGS="$LDFLAGS -no-undefined"
     dont_link_with_gmp="yes"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include "gmp.h"
#if !__GMP_LIBGMP_DLL
# error "Dead man"
#endif
     ]], [[]])],[AC_MSG_RESULT(DLL)],[ 
  AC_MSG_RESULT(static)
  AC_MSG_ERROR([gmp.h isn't a DLL: use --enable-static --disable-shared]) ])
   else
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include "gmp.h"
#if __GMP_LIBGMP_DLL
# error "Dead man"
#endif
     ]], [[]])],[AC_MSG_RESULT(static)],[
  AC_MSG_RESULT(DLL) 
  AC_MSG_ERROR([gmp.h is a DLL: use --disable-static --enable-shared]) ])
  fi
  ;;
esac
dnl Finally set up LibTool
AC_PROG_LIBTOOL


dnl 
dnl Setup GMP detection
dnl 

dnl Check GMP Header
AC_MSG_CHECKING(for gmp.h)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include "gmp.h"
]])],[AC_MSG_RESULT(yes)],[
 AC_MSG_RESULT(no)
 AC_MSG_ERROR([gmp.h can't be found, or is unusable.])
])

AC_MSG_CHECKING(for recent GMP)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include "gmp.h"
#if (__GNU_MP_VERSION*100+__GNU_MP_VERSION_MINOR*10 < 410)
# error "min GMP version is 4.1.0"
#endif
]])],[AC_MSG_RESULT(yes)],[
 AC_MSG_RESULT(no)
 AC_MSG_ERROR([GMP 4.1.0 min required])
])

dnl Check if we can use internal header files of GMP.
AC_MSG_CHECKING(for gmp internal files)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
]])],[
  AC_MSG_RESULT(yes)
  AC_DEFINE([MPFR_HAVE_GMP_IMPL],1,[Use GMP Internal Files])
  gmp_internal_file_check=yes
],[
  AC_MSG_RESULT(no) 
  AC_FUNC_ALLOCA
])

dnl Check for valid BITS_PER_MP_LIMB and BYTES_PER_MP_LIMB
dnl This test doesn't need to link with libgmp (at least it should).
if test -n "$gmp_internal_file_check" ; then
  AC_MSG_CHECKING(for valid BITS_PER_MP_LIMB and BYTES_PER_MP_LIMB)
  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <limits.h>
#include "gmp.h"
#include "gmp-impl.h"
]], [[
  return BITS_PER_MP_LIMB == BYTES_PER_MP_LIMB * CHAR_BIT
         && sizeof(mp_limb_t) == BYTES_PER_MP_LIMB ? 0 : 1;
]])], [AC_MSG_RESULT(yes)], [
       AC_MSG_RESULT(no)
       AC_MSG_ERROR([BITS_PER_MP_LIMB or BYTES_PER_MP_LIMB are incorrect.
You probably need to change some of the GMP or MPFR compile options.])],
       [AC_MSG_RESULT([can't test])])
fi


dnl We really need to link using libtool. But it is impossible with the current
dnl libtool.
dnl The practical problems appear only under MS Windows. The best solution
dnl is to believe it works under MSWin.
if test "$dont_link_with_gmp" = yes ; then 
LIBS="-lgmp $LIBS"
else
 
dnl Check if we can link with GMP
AC_CHECK_LIB(gmp, __gmp_version, [LIBS="-lgmp $LIBS"], 
 [AC_MSG_ERROR(libgmp not found)])

dnl Check if we can use mpn_sub_nc
if test -n "$gmp_internal_file_check" ; then
 AC_CHECK_FUNC([__gmpn_sub_nc], 
  [AC_DEFINE([MPFR_HAVE_MPN_SUB_NC],1,[Function mpn_sub_nc is available])])
fi

dnl Check for corresponding 'gmp.h' and libgmp.a
AC_MSG_CHECKING(if gmp.h version and libgmp version are the same)
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <string.h>
#include "gmp.h"
]], [[
  char buffer[100];
  if (__GNU_MP_VERSION_PATCHLEVEL != 0)
    sprintf (buffer, "%d.%d.%d", __GNU_MP_VERSION, __GNU_MP_VERSION_MINOR,
	    __GNU_MP_VERSION_PATCHLEVEL);
  else
    sprintf (buffer, "%d.%d", __GNU_MP_VERSION, __GNU_MP_VERSION_MINOR);
  printf ("(%s/%s) ", buffer, gmp_version);
  return (strcmp (buffer, gmp_version) != 0) ? 1 : 0;
]])], [AC_MSG_RESULT(yes)],
   [AC_MSG_RESULT(no)
    AC_MSG_WARN(['gmp.h' and 'libgmp' seems to have different versions.])],
    AC_MSG_RESULT([can't test])
)

dnl End of tests which need to link with GMP.
fi 

dnl Remove also many MACROS (AC_DEFINE) which are unused by MPFR
dnl and polluate (and slow down) the build.
if test -f confdefs.h; then
  sed '/#define PACKAGE_/d' <confdefs.h >confdefs.tmp
  sed '/#define HAVE_STRING/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_ALLOCA /d' <confdefs.h >confdefs.tmp
  sed '/#define HAVE_DLFCN_H/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_MEM/d' <confdefs.h >confdefs.tmp
  sed '/#define STDC_HEADERS/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_STRTOL/d' <confdefs.h >confdefs.tmp
  sed '/#define HAVE_STDLIB_H/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_UNISTD_H/d' <confdefs.h >confdefs.tmp
  sed '/#define HAVE_STDC_HEADERS/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_LONG_DOUBLE/d' <confdefs.h >confdefs.tmp
  sed '/#define HAVE_SYS_STAT_H/d' <confdefs.tmp >confdefs.h
  sed '/#define HAVE_SYS_TYPES_H/d' <confdefs.h >confdefs.tmp
  sed '/#define PROTOTYPES/d' <confdefs.tmp >confdefs.h
  sed '/#define __PROTOTYPES/d' <confdefs.h >confdefs.tmp

  mv confdefs.tmp confdefs.h
fi

dnl Output
AC_CONFIG_FILES([Makefile tests/Makefile mparam.h:mparam_h.in])
AC_OUTPUT

dnl NEWS README AUTHORS Changelog